FIPS code 06021 is Glenn County, California. With a population of 28,657 (2022 ACS estimate), it ranks #48 in California and #1503 nationally. The state FIPS code for California is 06. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
06021
Population
28,657
2022 ACS · #1503 nationally
Density
21.8/mi²
people per sq mile
Land Area
1,314
sq miles
Urban/Rural
Nonmetro — urban 2.5K–19.9K, adjacent to metro
RUCC 6
How This FIPS Code Works
The 5-digit FIPS code 06021 is formed by combining the 2-digit state identifier 06 (California) with the 3-digit county identifier 021. Together they uniquely identify Glenn County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 06021
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 06021.
Median Household Income
$64,033
ACS B19013_001E
Poverty Rate
15.3%
ACS B17001 (below poverty level)
Median Age
35.8
ACS B01002_001E
Adjacent Counties (5)
Counties that share a border with Glenn County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 06021.
Federal Datasets Using Code 06021
FIPS code 06021 appears as the county identifier in the following federal datasets. Analysts joining data across these sources use this code as the common geographic key.
Using FIPS Code 06021 in Code
Common patterns for querying federal datasets by this county's FIPS code. The leading zeros are significant — always treat FIPS codes as strings, not integers.
import requests
url = "https://api.census.gov/data/2022/acs/acs5"
params = {
"get": "NAME,B19013_001E,B01003_001E",
"for": "county:021",
"in": "state:06",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Glenn County, California, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '06021';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '06'
AND county_fips = '021';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 6021 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "06",
county = "021",
year = 2022
)ZIP Codes in Glenn County
ZIP codes do not align perfectly with county boundaries — a single ZIP code can span multiple counties, and a county can contain parts of many ZIP codes. The ratios below (from the Census 2020 ZCTA relationship file) show the land area share of each ZCTA that falls within Glenn County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 95988 | 100.0% |
| 95920 | 100.0% |
| 95939 | 100.0% |
| 95943 | 100.0% |
| 95951 | 100.0% |
| 95913 | 100.0% |
| 95963 | 88.5% |
| 95970 | 49.5% |